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 Mar 24 asked About this congruence implication Mar 12 accepted Help visualizing this quotient space Mar 12 comment Help visualizing this quotient space I was seeing that cylinder, just wanted to be able to visualize that "wrapping and stretching" a little bit better. Mar 11 awarded Custodian Mar 11 asked Help visualizing this quotient space Dec 17 awarded Caucus Dec 1 awarded Yearling Nov 12 reviewed Approve $e^{1/z}$ and Laurent expansion Sep 30 awarded Explainer Jul 2 awarded Curious Jun 27 comment Topologies on n-manifolds Well... by definition of a manifold, any topology of a manifold must the same topology (o equivalent) to the usual topology, as it must be locally homeomorphic to $\mathbb R^n$ with the usual topology. Jun 25 comment Geodesics of this metric Ok, I see it. Thank you very much Jun 25 accepted Geodesics of this metric Jun 25 comment Geodesics of this metric Thank you. How do you get from $\ddot x-C^2 /x^3=0$ to the solution $x(t)$? Jun 25 revised Geodesics of this metric added 164 characters in body Jun 25 asked Geodesics of this metric Jun 24 comment Let $G=\mathbb Z_4 \times \mathbb Z_2$. Find all $H$ subgroups of $G$ of order 2, so that $G / H$ is cyclic. Oh that was your question... I'm sorry, well We already found all the subgroups of order $2$, now do you hav any problem in computing the quotient groups $G/H$ Checking if it' cyclic is checking if the identity $H$ generates the whole group $G/H$. Jun 24 answered Let $G=\mathbb Z_4 \times \mathbb Z_2$. Find all $H$ subgroups of $G$ of order 2, so that $G / H$ is cyclic. Jun 24 comment Help understanding a proof in differential geometry I see your "firstly", I just don't see why it's neccesary in the argument. The fact that there are a finite number of points in which $df$ is singular comes from the expression of $P'$, right? Jun 24 comment Help understanding a proof in differential geometry Thank you both, it was a lot simpler than I thought.